john prendergast worked on africa policy in president clinton's white house. now he runs a group called the enough project, that exposes war crimes. what keeps this war going? >> well, you know, follow the money. it's good old-fashioned greed. we got kings and corporations and countries that have been plundering the congo for the last century. and today's version of armed groups, rebel groups, militia groups, the government army-- they're all fronts for mafia organizations, basically, that extract these minerals and profit from their smuggling and export back to the united states and to europe for our jewelry, our cell phones, and our laptops. >> mafia organizations? what do you mean by that? >> because they don't have an ideology. they're not trying to build a government institution. the rebels are not fighting for any particular cause. they are extracting these minerals--like gold, like tantalum, tin, and tungsten--in order to sustain themselves as predatory organizations. >> is the violence increasing, decreasing? >> it spikes. it comes in phases, and it's